I"m Convinced I Know Where That Superman Trailer Monster Came From

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The mystery monster seen in James Gunn"s Superman trailer might have a more familiar origin than it seems. As Superman"s first trailer suggests, the DCU is filled with all kinds of heroes, anti-heroes, villains, and creatures of all kinds by the time David Corenswet"s Superman stars in his own solo movie. Going by the confirmed projects in the DCU"s Gods and Monsters chapter, the DCU is already inhabited by Kryptonians, Amazons, Green Lanterns, mythological figures, robots, reanimated corpses, and mutated hybrids, among other characters.
James Gunn"s Superman will hit the ground running, as the first Superman trailer reveals multiple DC characters with wildly different origins and powersets who will likely receive their own DCU projects in the future. For example, Krypto the Superdog will appear in Supergirl: Woman of Tomorrow, The Engineer will probably appear in The Authority, and Mister Terrific"s superhero team might be the starting point for a Justice League International or a The Terrifics spinoff movie or show. There are at least two Superman characters whose identity and origin haven"t been revealed, though. Neither the masked villain nor the giant monster attacking Metropolis in the Superman trailer have been identified yet.
Jimmy Olsen Might Transform Into A Giant Monster In James Gunn’s Superman Jimmy Olsen Has Transformed Into Several Monsters In The Comics

Custom image by Nicolas Ayala A giant fire-breathing monster appears in only one brief shot of the first Superman trailer. There are no clues as to where this creature came from or whether someone else is controlling it. The Man of Steel has faced his fair share of monsters and giant creatures in the source material, but one of the most remarkable is none other than Superman’s best friend, Jimmy Olsen. In the Superman’s Pal, Jimmy Olsen series of Silver Age comics, Jimmy repeatedly transformed into a wide variety of creatures, including a reptile, a porcupine, a werewolf, and even a "Bizarro" Jimmy. Jimmy Olsen’s most destructive transformation, however, is a gigantic turtle-man.
James Gunn’s Superman could make Jimmy Olsen the subject of a scientific experiment that transforms him into the fire-breathing kaiju seen in the first trailer
In 1961’s Superman"s Pal, Jimmy Olsen vol 1 #53, Jimmy finds an “enlarging ray” that he uses on a turtle and himself. The device merges both of them, creating a Turtle-Man kaiju that Superman has to stop in order to save the city. While the movie is unlikely to adapt this story, James Gunn’s Superman could make Jimmy Olsen the subject of a scientific experiment that transforms him into the fire-breathing kaiju seen in the first trailer. Considering how many sci-fi and fantast elements Superman already has, it wouldn’t be a surprise to see Jimmy suffer a similar experience in the DCU’s first live-action installment.
Superman’s Multiple Villains Make Jimmy Olsen Likely To Be Experimented With Jimmy Olsen Could Be The Target Of Several DCU Villains Close James Gunn’s Superman could incorporate Jimmy Olsen’s kaiju transformation into its plot by making him a victim of one of Superman’s many antagonists. Lex Luthor, The Engineer, Maxwell Lord, Rick Flag Sr., and the mysterious masked villain could be behind the monster"s attack on Metropolis. Lex Luthor, The Engineer, and Maxwell Lord may possess the necessary technology to transform Jimmy into a kaiju, while Rick Flag Sr."s experience with the Creature Commandos might have taught him how to weaponize monster DNA. Superman"s mystery villain — who could be Ulysses or Ultraman — could receive a brand-new ability to create metahumans and monsters in the DCU.

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